What Is The Highest Megapixel PTZ Speeddome?

By speeddome I mean 360 endless and at least 18x zoom. Over 1080P what is there? I can only find a couple 3MP Dahuas, like this one: (also very similar to the 150m FLIR, but with 3MP and 20x), amazingly for about $1000. Anything else?

I have not seen a 5MP nor higher speed dome. Typically one would use a fixed camera with a zoom lens and a pan-tilt positioner.